This is the kind of humourless reaction that will literally make satire — and, potentially, absolutely all rhetoric — unviable. If we are no longer allowed to portray 'bad' people in fiction, what does that say about the quality of our storytelling and where it's going?
Please don't speak for people whoes motivation you probably dont fully understand. "Everyone" is always and per definition wrong, absolute statements like this only show that you are going to far and shouldn't be taken seriously.
I am a member of a minority, and I do enjoy jokes about my minority if they're well done and/or hit a nail on the head. Your statement effectively says you dont believe I am a member of "everyone", which is quite condescending.
The people in Always Sunny are awful people to be around: comically stupid, ignorant, selfish, sociopathic, repressed, narcissistic, scheming and oblivious. That is the joke. Take a group of morons with the above qualities, and worse, who own a bar in Philly. Hilarity ensues with how awful they are. Like a train wreck. That's the premise. And a further meta joke is on anyone who would "identify" with them.
Depiction is not endorsement. Do you think Leonardo DiCaprio is a racist for playing a slave owner in Django Unchained? Is Christoph Waltz a Nazi for playing Hans Landa?